Drawworks brake rim construction



Aug. 30, 1932. A. E. RICE DRAWWORKS BRAKE RIA? CONSTRUCTION Filed Sept. 6. 1930 2 u n oo .o l@ o noo nun nu un 7 [I4 7 f vp m" n nn 16. Dn. Tf1.: un. o U o oo l... Do.- o oo Do Patented Aug. 30, 1932 UNITED STAT-Es PATENT; OFFICE ALLEN ERWIN RICE, OF HERMOSA BEACH, CALIFORNIA, ASSIGNOR TO THE NATIONAL SUPPLY COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO DRAWWORKS BRAKE RIM CONSTRUCTION Application led September 6, 1930. Serial No. 480,065.

This invention relates to drawworks brake rim construction7 and more particularly to the construction of a brake rim for a rotary drawworks to provide a means for cooling the brake rim and for conveying the water along and over the increased heat transfer surface of the brake rim. In the operation of a rotary drawworks as employed in the drilling of wells, such' as Yoil wells, rotary drawworks are provided which include cable spooling drums which are provided generalfrom the well many times during the drill-- ing of the wells and it is essential that the drum of the drawworks be operated at high speed during both the pulling of the drill stem and the lowering of the drill stem into the Well. The brakes used in controlling this operation become very hot and are subjected to most extreme conditions. Differ- 'ent forms of .water cooling means have heretofore been provided for absorbing heat developed by the brake rims by the use of cooling water or the like.

It is the principal object of this invention to provide a brake rim which has an increased heat transfer surface and is provided with a means for delivering water to the interior of the brake rims, the brake rims being formed so as to convey over and hold the water on the increased heat transfer surface of the brake rims.

Another object of this invention is to provide a brake rim which is provided with a rib on its inner periphery which is formed integral with the brake rim and is formed to provide a spiral on the interior of the brake rim for conveying the cooling liquid from the outer edge of the brake rim to the inner edge thereof as it is delivered to the brake rim, the spirally-formed rib providing increased heat transfer surface and likewise providing a means for holding and conveying the cooling water along and over the increased heat transfer surface of the brake rim.

Other objects and advantages of this invention it is believed will be apparent-from the following detailed description of a preferred embodiment thereof as illustrated in the accompanying drawing.

In the drawing:

Figure 1 illustrates a fragment of a rotary drawworks showing the drum thereof principally in vertical mid-section, the drum having brake rims embodying my invention at its opposed ends.

Figure 2 is a sectional view on an enlarged scale of the brake rim-embodying my invention.

The brake rim embodying is adapted for use in connection with any of the numerous forms of drawworl now in use, and the drawworks herein illustrated is my invention are, secured to the spaced iianges 7 of the drawworks drum 4. The brake rims are formed with inwardly extending annular anges 8 at their inner and adjacent ends, and the flanges 8 fit annular shoulders 9 formed on the flanges 7 of the drum 4 and are secured in position by means of rivets 10 or like securing means. The brake rims 5 are formed at their outer end with brake retaining flanges-11 which extend outwardly from the rims 5 and with the upwardly extending edge 12 of the flanges 7 define the braking surface 13 upon which the brake bands 6 are mounted.

In order to provide for increased heat transfer surface for the brake rim 5, the inner periphery of the brake rim 5 is formed integral with a rib 14 which is formed spirally upon the inner periphery of the rim 5 to provide inwardly extending valleys 15, the depth of which decrease from the outer edge of the rim 5 to the inner edge thereof.

The valleys 15 are adapted to receive a cooling liquid which may be delivered to the periphery of the brake rim 5 by any suitable or desirable manner such, for example, as by means of a spray pi e 16 provided with a plurality'of spray per orations 17 along its length. The spray pipe 16 is connected in any suitable or desirable manner with the source of water under pressure. As the water from the spray pipe 16 is delivered'to the brake rim 5 it fills the valleys 15 formed on the inner periphery of the rim 5. As the water finds its way into thev valleys 15 it is caused to travel from the outer of the valleys 15 tol the inner of the valleys 15 by the spirally formed rib 14 defining the valleys 15. The water thus delivered along through the valleys 15 is caused to travel over and is maintained in contact with the heat transfer surface formed on the inner periphery of the brake rim 5. Thel water thus delivered to the inner periphery of the brake rim 5 is held in contact wth the increasing heat transfer surface for a maximum period of time and the water as delivered to the brake rim all flows to the inner edge thereof adjacent the flanges 7 within the valleys or valley 15 formed by the spirally wound rib 14 and then o'ws back across the top of the rib 14 at the bottom of the drum in passing outwardly from the brake rims 5. "The fact that the brake` rim 5 is rotated at a relatively high rate acts to maintain the cooling water in contact with thebrake rim 5 .for the greater portion of each rotation of the brake rim 5 when the water is sprayed into the valleys 15 from the upper point of the rim 5.

Having fully described my invention, it is to be understood that I do not wish to be limited to the details herein set forth, but inv invention is of the' full scope of the appended claims.

I claim:

1. In a'rota draww'orks, the combination of a drum, bra e rims at the opposite ends of the drum, spirally formed ribs on the inner ripheries of lsaid brake rims, means for elivering water within the inner peripheries of said brake rims.

2. In a rotarydrawworks, the combination of a drum, means rotatably supporting the rim from the outer drum, brake rims at the oposite ends of said drum alternate ribs and valleys on the inner percilp eries of said brake rims, the valley exten mg spirally around the periphery of said brake rims from the outer edge thereof to thefinner edge thereof, and means for delivering water to within said brake rims.

4. In a rotary drawworks, the combination of a drum means rotatably supportin the drum, bralre rims at the o posite en s of said drum, alternate ribs and valleys on the inner peripheries of said brake rims, the valleys extending spirally around the perilpheries of said brake rims from the outer e ge thereof to the inner edge thereof, and means for spraying cooling water at points along the inner peripheries of said brake rims.

5. In a rotary drawworks, the combination of a drum, means rotatably supporting the Adrum, a brake rim at one end of said drum, a

rib formed spirally on the inner periphery of said rim and forming alternate ribs and a valley extending spirally from the outer edge of the brake rim tothe inner edge thereof, t e valley being of decreasing depth from the outer periphe to the inner periphery of the brake rim, andymeans for spraying a cooling liquid against the inner eriphery of said brake rim at points spaces along the width of said brake rim.

6. In a hoisting structure, the combination of wdrum, a brake rim at one end of the drum, a spirally formed rib on the inner periphery of said brake rim, means for deliverin water within the inner periphery of said bra e rim.

7. In a hoisting structure, the combination of a drum, means rotatabl supporting the drum, a brake rim at one en of the drum, alternate ribs and valleys on the inner periphery of said brake rim, the valleys extending riphery of the brake ge thereof to the inner edge thereof,-and means for deliverin cooling water at points along the inner periphery of said brakev rim.

Signed at Torrance this 22nd day of August, 1930. f I ALLEN ERWIN RICE.

spirally around the drum, brake rims mounted at the opposite v ends of said drums, means formed on the inner peripheries of said rims for conveying water from the outer edges to the inner ed of said brake rims, and means for delivering cooling water within' said brake rims.

8. In a rotary drawworks, the combination of a drum, means rotatably supporting the 

